The present proposals relates to an insecticide or miticide composition comprising a fatty acid/amino acid salt. The fatty acid component comprises one or more unsaturated fatty acids having from 14 to 22 carbon atoms, and one or more saturated fatty acids having from 8 to 18 carbon atoms； wherein the one or more saturated fatty acids having from 8 to 18 carbon atoms forms at least 15 wt% of the fatty acid component. Furthermore the weight ratio of unsaturated fatty acids having from 14 to 22 carbon atoms to saturated fatty acids having from 8 to 18 carbon atoms is at least 1. Also claimed is the use of the of the composition as an insecticide or miticide, and a method of killing insects and/or mites on a plant by treating the plant with the composition. The composition demonstrates low phytotoxitcity even at relatively high concentrations combined with highly effective insecticidal and miticidal activity.
